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Water-based lost foam casting coating with aquadag for magnesium alloy casting and preparation method thereof

A technology of colloidal graphite and lost foam, applied in casting molding equipment, metal processing equipment, coating, etc., can solve the problems of unsatisfactory flame retardant effect, poor thermal conductivity of coating, high cavity temperature, etc., and achieve easy peeling and cleaning, excellent Heat conduction, quality improvement effect

Inactive Publication Date: 2016-07-13
HUOQIU COUNTY XINRUI METAL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Development of Magnesium Alloy Coatings for Lost Foam Casting with Quartz Powder" uses quartz powder and diatomite as refractory aggregates, sodium bentonite and CMC as suspending agents, and dextrin and silica sol as binders to prepare high-permeability coatings. Magnesium alloy lost foam coating with flame retardant effect, however, the thermal conductivity of the coating formed during the casting process of this coating is poor, resulting in high temperature in the cavity, unsatisfactory flame retardant effect, and a large amount of combustion and oxidation of magnesium metal leads to serious defects in castings

Method used

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Experimental program
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Embodiment Construction

[0015] A water-based lost foam coating containing colloidal graphite for magnesium alloy casting, characterized in that the coating is made of the following raw materials in parts by weight: quartz powder 40, thermally conductive modified diatomite 10, hydroxypropyl methylcellulose 2. Ethyl orthosilicate 2, colloidal graphite powder 5, sodium trimethylsiliconate 0.5, sodium lignosulfonate 0.1, palygorskite 2, zinc borate 0.1, absolute ethanol 20, deionized water 30, the concentration is 15% dilute hydrochloric acid solution 5.

[0016] Wherein the thermally conductive modified diatomite is prepared by the following method:

[0017] (1) Firstly, the diatomite is crushed after removing impurities, passed through a 200-mesh sieve, and the sieved matter is used for later use;

[0018] (2) Mix aluminum isopropoxide with deionized water, heat the water bath to 80°C, and stir the solution ultrasonically for 2 hours. After the pH value of the solution no longer changes, add an approp...

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Abstract

The invention discloses a water-based lost foam casting coating with aquadag for magnesium alloy casting.According to the lost foam casting coating, kieselguhr and quartz sand which are subjected to heat conductive modification are used as refractory aggregate, palygorskite with the surface treated by sodium trimethylsilanolate is added, and therefore the coating has the good suspension property and rheological property; in addition, the aquadag is added, and therefore the coating has the advantages of being good in heat conduction, adsorbability, oxidation resistance, seepage prevention and the like.The adjusting effect on the temperature inside a casting cavity is achieved, the phenomenon of magnesium alloy peroxide combustion is effectively relieved, sand adhering is avoided after the coating is in use, disengagement is easy, and the quality of a magnesium alloy casting is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lost foam casting coatings, in particular to a water-based lost foam coating containing colloidal graphite for magnesium alloy casting and a preparation method thereof. Background technique [0002] In recent years, magnesium alloys are gradually replacing part of iron and steel due to their excellent comprehensive properties, and have become more and more widely used materials, especially in the fields of automobiles and aviation, and lost foam casting magnesium alloy castings are also eye-catching The use of lost foam casting technology has the advantages of simple process, high casting dimensional accuracy, and small machining allowance. However, due to the low pouring temperature in the lost foam casting process of magnesium alloy castings, it is difficult to gasify the lost foam, and Most of the molds are in liquid state, and the magnesium metal is active, so it is easy to oxidize and burn, which eve...

Claims

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Application Information

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IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 黄学勇
Owner HUOQIU COUNTY XINRUI METAL PROD